Chevrolet Performance 19301622 Shifter Handle

The product description is severely lacking important details. Details like the thread pitch on the shift knob threads. I figured the threads would be the standard M16x1.50 thread pitch but it is much smaller. It also doesn't state what transmission it will fit either. In the "overview" section, it states all about the T56 MAGNUM so I figured it would fit a Magnum. I purchased a brand new T56 Magnum-F with the factory Tremec shifter, the bolt holes on the shifter are larger than the ones on this shift rod meaning the only way to get this rod to work is if i drilled the threads out to a larger size.